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      <a href="/2017/08/19/webpack-multi-project-6-hot-reload/" title="webpack多页面配置6--热加载刷新" itemprop="url">webpack多页面配置6--热加载刷新</a>
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      <a href="https://godbasin.github.io" title="被删">被删</a>
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    <time datetime="2017-08-19T11:39:41.000Z" itemprop="datePublished">2017-08-19</time>
    更新日期:<time datetime="2017-08-19T11:40:27.937Z" itemprop="dateModified">2017-08-19</time>
    
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			<strong class="toc-title">文章目录</strong>
		<ol class="toc"><li class="toc-item toc-level-2"><a class="toc-link" href="#webpack插件"><span class="toc-number">1.</span> <span class="toc-text">webpack插件</span></a><ol class="toc-child"><li class="toc-item toc-level-3"><a class="toc-link" href="#Express和Webpack"><span class="toc-number">1.1.</span> <span class="toc-text">Express和Webpack</span></a></li><li class="toc-item toc-level-3"><a class="toc-link" href="#webpack-dev-middleware"><span class="toc-number">1.2.</span> <span class="toc-text">webpack-dev-middleware</span></a></li><li class="toc-item toc-level-3"><a class="toc-link" href="#webpack-hot-middleware"><span class="toc-number">1.3.</span> <span class="toc-text">webpack-hot-middleware</span></a></li><li class="toc-item toc-level-3"><a class="toc-link" href="#实现热加载和页面刷新"><span class="toc-number">1.4.</span> <span class="toc-text">实现热加载和页面刷新</span></a></li></ol></li><li class="toc-item toc-level-2"><a class="toc-link" href="#结束语"><span class="toc-number">2.</span> <span class="toc-text">结束语</span></a></li></ol>
		</div>
		
		<p>最近项目中需要搭建一个多页面的环境，包括本地路由服务和分页面打包。<br>本节介绍开发部署时，实现热加载和页面刷新。<br><a id="more"></a></p>
<h2 id="webpack插件"><a href="#webpack插件" class="headerlink" title="webpack插件"></a>webpack插件</h2><hr>
<h3 id="Express和Webpack"><a href="#Express和Webpack" class="headerlink" title="Express和Webpack"></a>Express和Webpack</h3><p><code>Express</code>本质是一系列<code>middleware</code>的集合，因此，适合<code>Express</code>的<code>webpack</code>开发工具是<code>webpack-dev-middleware</code>和<code>webpack-hot-middleware</code>。<br>详细例子说明也可参考<a href="https://segmentfault.com/a/1190000004505747" target="_blank" rel="external">《Express结合Webpack的全栈自动刷新》</a>。</p>
<h3 id="webpack-dev-middleware"><a href="#webpack-dev-middleware" class="headerlink" title="webpack-dev-middleware"></a><a href="https://www.npmjs.com/package/webpack-dev-middleware" target="_blank" rel="external">webpack-dev-middleware</a></h3><p><code>webpack-dev-middleware</code>是一个处理静态资源的<code>middleware</code>。</p>
<p>有时候我们无需使用到<code>Express</code>，我们常常使用<code>webpack-dev-server</code>开启动服务。<br><code>webpack-dev-server</code>实际上是一个小型<code>Express</code>服务器，它也是用<code>webpack-dev-middleware</code>来处理<code>webpack</code>编译后的输出。</p>
<h3 id="webpack-hot-middleware"><a href="#webpack-hot-middleware" class="headerlink" title="webpack-hot-middleware"></a><a href="https://www.npmjs.com/package/webpack-hot-middleware" target="_blank" rel="external">webpack-hot-middleware</a></h3><p><code>webpack-hot-middleware</code>是一个结合<code>webpack-dev-middleware</code>使用的<code>middleware</code>，它可以实现浏览器的无刷新更新（<code>hot reload</code>）。<br>这也是<code>webpack</code>文档里常说的HMR（Hot Module Replacement）。</p>
<h3 id="实现热加载和页面刷新"><a href="#实现热加载和页面刷新" class="headerlink" title="实现热加载和页面刷新"></a>实现热加载和页面刷新</h3><p>其实如果将热加载定义为文件变动时重新编译的话，其实我们上一节已经完成了。<br>但热加载的功能，不搭配页面自动刷新的话，其实就不完整了呢。</p>
<p>需要调整三个地方：</p>
<ol>
<li>每个页面入口需要添加<code>webpack-hot-middleware/client?reload=true</code>。</li>
<li>在webpack配置中添加plugin插件<code>new webpack.HotModuleReplacementPlugin()</code>。</li>
<li>在<code>Express</code>实例中添加中间件<code>&#39;webpack-hot-middleware&#39;</code>。</li>
</ol>
<p>故我们的代码为：</p>
<figure class="highlight js"><table><tr><td class="gutter"><pre><div class="line">1</div><div class="line">2</div><div class="line">3</div><div class="line">4</div><div class="line">5</div><div class="line">6</div><div class="line">7</div><div class="line">8</div><div class="line">9</div><div class="line">10</div><div class="line">11</div><div class="line">12</div><div class="line">13</div><div class="line">14</div><div class="line">15</div><div class="line">16</div><div class="line">17</div><div class="line">18</div><div class="line">19</div><div class="line">20</div><div class="line">21</div><div class="line">22</div><div class="line">23</div><div class="line">24</div><div class="line">25</div><div class="line">26</div><div class="line">27</div><div class="line">28</div><div class="line">29</div><div class="line">30</div><div class="line">31</div><div class="line">32</div><div class="line">33</div><div class="line">34</div><div class="line">35</div><div class="line">36</div><div class="line">37</div><div class="line">38</div><div class="line">39</div><div class="line">40</div><div class="line">41</div><div class="line">42</div><div class="line">43</div><div class="line">44</div><div class="line">45</div><div class="line">46</div><div class="line">47</div><div class="line">48</div><div class="line">49</div><div class="line">50</div><div class="line">51</div><div class="line">52</div><div class="line">53</div><div class="line">54</div><div class="line">55</div><div class="line">56</div><div class="line">57</div><div class="line">58</div><div class="line">59</div><div class="line">60</div><div class="line">61</div><div class="line">62</div><div class="line">63</div><div class="line">64</div><div class="line">65</div><div class="line">66</div><div class="line">67</div><div class="line">68</div><div class="line">69</div><div class="line">70</div><div class="line">71</div><div class="line">72</div><div class="line">73</div><div class="line">74</div><div class="line">75</div><div class="line">76</div><div class="line">77</div><div class="line">78</div><div class="line">79</div><div class="line">80</div><div class="line">81</div><div class="line">82</div><div class="line">83</div><div class="line">84</div><div class="line">85</div><div class="line">86</div><div class="line">87</div><div class="line">88</div><div class="line">89</div><div class="line">90</div><div class="line">91</div><div class="line">92</div></pre></td><td class="code"><pre><div class="line"><span class="comment">// build/dev-server.js</span></div><div class="line"><span class="comment">// dev-server.js</span></div><div class="line"><span class="keyword">var</span> path = <span class="built_in">require</span>(<span class="string">'path'</span>)</div><div class="line"><span class="keyword">var</span> express = <span class="built_in">require</span>(<span class="string">'express'</span>)</div><div class="line"><span class="keyword">var</span> utils = <span class="built_in">require</span>(<span class="string">'./utils'</span>)</div><div class="line"><span class="keyword">var</span> webpack = <span class="built_in">require</span>(<span class="string">'webpack'</span>)</div><div class="line"><span class="keyword">var</span> webpackConfig = <span class="built_in">require</span>(<span class="string">'./webpack.config'</span>)</div><div class="line"><span class="keyword">var</span> HtmlWebpackPlugin = <span class="built_in">require</span>(<span class="string">'html-webpack-plugin'</span>)</div><div class="line"><span class="keyword">var</span> WebpackDevMiddleware = <span class="built_in">require</span>(<span class="string">'webpack-dev-middleware'</span>)</div><div class="line"><span class="keyword">var</span> WebpackHotMiddleware = <span class="built_in">require</span>(<span class="string">'webpack-hot-middleware'</span>)</div><div class="line"></div><div class="line"><span class="comment">// Express实例</span></div><div class="line"><span class="keyword">var</span> app = express()</div><div class="line"></div><div class="line"><span class="comment">// 获取页面目录</span></div><div class="line"><span class="keyword">var</span> entries = utils.entries</div><div class="line"><span class="comment">// entry中添加HotUpdate地址</span></div><div class="line"><span class="keyword">var</span> hotMiddlewareScript = <span class="string">'webpack-hot-middleware/client?reload=true'</span></div><div class="line"></div><div class="line"><span class="comment">// 重置入口entry</span></div><div class="line">webpackConfig.entry = &#123;&#125;</div><div class="line"><span class="comment">// 设置output为每个页面[name].js</span></div><div class="line">webpackConfig.output.filename = <span class="string">'[name].js'</span></div><div class="line">webpackConfig.output.path = path.join(__dirname, <span class="string">'dist'</span>)</div><div class="line"></div><div class="line"><span class="built_in">Object</span>.keys(entries).forEach(<span class="function"><span class="keyword">function</span> (<span class="params">name</span>) </span>&#123;</div><div class="line">    <span class="comment">// 每个页面生成一个entry</span></div><div class="line">    <span class="comment">// 这里修改entry实现HotUpdate</span></div><div class="line">    webpackConfig.entry[name] = [entries[name], hotMiddlewareScript]</div><div class="line">    </div><div class="line">    <span class="comment">// 每个页面生成一个[name].html</span></div><div class="line">    <span class="keyword">var</span> plugin = <span class="keyword">new</span> HtmlWebpackPlugin(&#123;</div><div class="line">        <span class="comment">// 生成出来的html文件名</span></div><div class="line">        filename: name + <span class="string">'.html'</span>,</div><div class="line">        <span class="comment">// 每个html的模版，这里多个页面使用同一个模版</span></div><div class="line">        template: <span class="string">'./index.html'</span>,</div><div class="line">        <span class="comment">// 自动将引用插入html</span></div><div class="line">        inject: <span class="literal">true</span>,</div><div class="line">        <span class="comment">// 每个html引用的js模块，也可以在这里加上vendor等公用模块</span></div><div class="line">        chunks: [name]</div><div class="line">    &#125;)</div><div class="line">    webpackConfig.plugins.push(plugin)</div><div class="line">&#125;)</div><div class="line"></div><div class="line">webpackConfig.plugins.push(<span class="keyword">new</span> webpack.HotModuleReplacementPlugin())</div><div class="line"></div><div class="line"><span class="comment">// webpack编译器</span></div><div class="line"><span class="keyword">var</span> compiler = webpack(webpackConfig)</div><div class="line"></div><div class="line"><span class="comment">// webpack-dev-server中间件</span></div><div class="line">app.use(WebpackDevMiddleware(compiler, &#123;</div><div class="line">    <span class="attr">publicPath</span>: <span class="string">'/'</span>,</div><div class="line">    <span class="attr">stats</span>: &#123;</div><div class="line">        <span class="attr">colors</span>: <span class="literal">true</span>,</div><div class="line">        <span class="attr">chunks</span>: <span class="literal">false</span></div><div class="line">    &#125;,</div><div class="line">    <span class="attr">progress</span>: <span class="literal">true</span>,</div><div class="line">    <span class="attr">inline</span>: <span class="literal">true</span>,</div><div class="line">    <span class="attr">hot</span>: <span class="literal">true</span></div><div class="line">&#125;))</div><div class="line"></div><div class="line">app.use(WebpackHotMiddleware(compiler))</div><div class="line"></div><div class="line"><span class="comment">// 路由</span></div><div class="line">app.get(<span class="string">'/:pagename?'</span>, <span class="function"><span class="keyword">function</span> (<span class="params">req, res, next</span>) </span>&#123;</div><div class="line">    <span class="keyword">var</span> pagename = req.params.pagename</div><div class="line">        ? req.params.pagename + <span class="string">'.html'</span></div><div class="line">        : <span class="string">'index.html'</span></div><div class="line"></div><div class="line">    <span class="keyword">var</span> filepath = path.join(compiler.outputPath, pagename)</div><div class="line"></div><div class="line">    <span class="comment">// 使用webpack提供的outputFileSystem</span></div><div class="line">    compiler.outputFileSystem.readFile(filepath, <span class="function"><span class="keyword">function</span> (<span class="params">err, result</span>) </span>&#123;</div><div class="line">        <span class="keyword">if</span> (err) &#123;</div><div class="line">            <span class="comment">// something error</span></div><div class="line">            <span class="keyword">return</span> next(<span class="string">'输入路径无效，请输入目录名作为路径，有效路径有：\n/'</span> + <span class="built_in">Object</span>.keys(entries).join(<span class="string">'\n/'</span>))</div><div class="line">        &#125;</div><div class="line">        <span class="comment">// 发送获取到的页面</span></div><div class="line">        res.set(<span class="string">'content-type'</span>, <span class="string">'text/html'</span>)</div><div class="line">        res.send(result)</div><div class="line">        res.end()</div><div class="line">    &#125;)</div><div class="line">&#125;)</div><div class="line"></div><div class="line"><span class="built_in">module</span>.exports = app.listen(<span class="number">8080</span>, <span class="function"><span class="keyword">function</span> (<span class="params">err</span>) </span>&#123;</div><div class="line">    <span class="keyword">if</span> (err) &#123;</div><div class="line">        <span class="comment">// do something</span></div><div class="line">        <span class="keyword">return</span></div><div class="line">    &#125;</div><div class="line"></div><div class="line">    <span class="built_in">console</span>.log(<span class="string">'Listening at http://localhost:8080\n'</span>)</div><div class="line">&#125;)</div></pre></td></tr></table></figure>
<p>这样，我们就实现了代码的热加载以及页面自动刷新了。</p>
<h2 id="结束语"><a href="#结束语" class="headerlink" title="结束语"></a>结束语</h2><hr>
<p>本节我们讲述了在webpack中添加代码热加载和页面自动刷新的功能，主要使用了<code>webpack-dev-middleware</code>和<code>webpack-hot-middleware</code>两个插件工具。<br>可参考代码<a href="https://github.com/godbasin/vue-multi-pages" target="_blank" rel="external">github-vue-multi-pages</a>，主要是这套环境使用在vue上的demo。</p>
  
		
		<p style="margin-top:50px;">查看Github有更多内容噢：<a href="https://github.com/godbasin">https://github.com/godbasin</a></p>
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	<p style="text-align: center;margin-top: 10px;margin-bottom: 20px;">码生艰难，写文不易，给我家猪囤点猫粮了喵~</p>
	<div class="author-right">
  		<p>作者：被删</p>
  		<p>出处：<a href="https://godbasin.github.io">https://godbasin.github.io</a></p>
  		<p>本文版权归作者所有，欢迎转载，但未经作者同意必须保留此段声明，且在文章页面明显位置给出原文连接，否则保留追究法律责任的权利。</p>
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  <ol class="toc"><li class="toc-item toc-level-2"><a class="toc-link" href="#webpack插件"><span class="toc-number">1.</span> <span class="toc-text">webpack插件</span></a><ol class="toc-child"><li class="toc-item toc-level-3"><a class="toc-link" href="#Express和Webpack"><span class="toc-number">1.1.</span> <span class="toc-text">Express和Webpack</span></a></li><li class="toc-item toc-level-3"><a class="toc-link" href="#webpack-dev-middleware"><span class="toc-number">1.2.</span> <span class="toc-text">webpack-dev-middleware</span></a></li><li class="toc-item toc-level-3"><a class="toc-link" href="#webpack-hot-middleware"><span class="toc-number">1.3.</span> <span class="toc-text">webpack-hot-middleware</span></a></li><li class="toc-item toc-level-3"><a class="toc-link" href="#实现热加载和页面刷新"><span class="toc-number">1.4.</span> <span class="toc-text">实现热加载和页面刷新</span></a></li></ol></li><li class="toc-item toc-level-2"><a class="toc-link" href="#结束语"><span class="toc-number">2.</span> <span class="toc-text">结束语</span></a></li></ol>
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